Also a factor, the longer the lens, the narrower the depth of field at the same f stop on a shorter lens.
-----Original Message----- >From: Mark Roberts <postmas...@robertstech.com> >Sent: Jun 5, 2012 9:27 AM >To: Pentax-Discuss Mail List <pdml@pdml.net> >Subject: Re: How much difference does optimizing the aperture make? > >Larry Colen wrote: > >>I was thinking about my quest for sharpness, and was considering trying >>to do some research into what the aperture "sweet spot" is for each lens, >>and was wondering if anyone had already made a chart of them. > >The sweet spot for sharpness is usually around f/5.6-f/8, depending on >the lens. Of course, depending on the lens and the composition of your >photo you might need more depth of field than the optimum aperture >yields, so sharpness and DOF is usually a compromise. (Also, sharpness >and shutter speed can be a trade-off too if you're trying to get >motion blur from long shutter speed. I run into this problem when >shooting waterfalls and such and I'm forced to stop way down to f/22 - >another reason I'm wishing for a DSLR with *lower* ISO settings.) > >With a Pentax camera and a Pentax lens it's easy to find the sharpest >aperture: Just set the camera's Program exposure line into "MTF" mode >and use Program auto exposure: the camera will read the MTF data >that's written into the chip in the lens and set the aperture to the >optimum value for that lens. I don't know of any other camera maker >that offers this feature. > >-- >Mark Roberts - Photography & Multimedia >www.robertstech.com > > > > > >-- >PDML Pentax-Discuss Mail List >PDML@pdml.net >http://pdml.net/mailman/listinfo/pdml_pdml.net >to UNSUBSCRIBE from the PDML, please visit the link directly above and follow >the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
